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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1028bfacd2ff992fb7103bd864d1535986df3fd951aa97f68bc3c2b94a33121f' 
  AND token = 'HzpQl910yTZ7B6y7jRyoLA78fX4ivsX1Es8DkZbPI4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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