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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a1135491a066fb137246aa5cce0ab9a4342534e15d2a78e04e49cb42d5278c' 
  AND token = 'dIqamOQ80uSuP+FEYH/rLQLZ2cou33ociokPGD8Sb8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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