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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529542cde635db2c8f994b84b9eee96526b7fff5b7e885701b1e7e89e03cd0e3' 
  AND token = 'GqxQUXpUa+dRu9VHkFfZ5lGnukJoopyQW9TP/S7odhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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