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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b36a7ff7ab78af7d36e5f4417627eff882b40672c6475d55937e1b3db5d814' 
  AND token = 'vu7eqFCPBm56jnluqLI4Djszyto/IJNAP2p9KUby0f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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