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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aca4841c59f2fec88fb8166e78b7b7836b6f9656faf7d3590555d4e6b32bab' 
  AND token = '4NKoE04XoGC+oCt3HOdnPwrIesNIPJdwpBBJR+wAO3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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