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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f016a0e5f032337985a68454735791bba053f658df6d919ba02f96e6c45989' 
  AND token = 'X6Q0JXwL+aOpOoodeh2axHl+1q1B6tGUYIqqNyyQuNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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