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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d93f5a4750ba11d0555c8f5bf9764413c496c890f53178e79ca2c770af596b' 
  AND token = 'ixk9Bp/4yGZrGMqC6bHBcL76DKN9EyWUo8s6+D0giGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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