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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0d786259c9275027ded0a292e654ab723e29af278b6c771c51e85bc3ffd855' 
  AND token = '6FlmEd/Eym9tEYWCVtYoVuzya6MgqEN8CivMRHAfvzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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