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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90da51b9848deed3d6c205359264b2c8c1f58e732b647343a69266ecf80b98ab' 
  AND token = 'KNWRJ7nmP1jD3e4DqVVqcKiBKptDj1yy7pPgaWXMT50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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