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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb39f86c02db341014c5009a65a4798bd5a33d1bfc8b8d711bd3e44219d4749' 
  AND token = 'kv5++Ew7xB+/52SY9X6y7xGyLsAS+oI/a+ysR6Ld9do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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