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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546b608c3c22fe8b643a8c3e9a632d60a3d349313656b7a2115c4be34c2ce13e' 
  AND token = 'CWDZ0dq8NeqkkJxLo9fao5l9JRln1Jbk+8CG2/3v53c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}