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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c301a90805ff991546ae8aa554f5898a00c36a92028dd56103f10e93a84cef' 
  AND token = 'E3Rf8reoCYELjWjNmg9qNAd8Y/kijlMdBp731XTKmGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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