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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3401767f57c733acd1156645386b9ccbc95b57c37dcefddd360c82b74264b1c' 
  AND token = 'GaLqLVgpTfILzvzGU0x+w9yyOPnxa5dhsSaNQZFOtl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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