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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2642e6e8abba2bab69f7ab5c050888fddd04184a955183f482501ad9523733' 
  AND token = 'D0Mm7KXP87dM/nHIPEnstiDY+VUV6IoFoxedNAuJE9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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