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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bea9047ead27f9ec45dd50ef04db0d31c3c694ac4d695c0ed38e82f3d740fa' 
  AND token = 'AIhDsysymFOIz8C/hUyhFG60HpR9D2OWLLMOqqqGlp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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