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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccf70bcbebdef51d6cf8cc2dd10f39c51a03ce0e859e7d63683a97019090378' 
  AND token = 'f4cE31hZpoJKDpZVWgs6HfmMexAzoW82C/Ucwgrgdss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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