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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bada5ba544b1b4fdde8c4c739c8bb15efe6b73cd85f58106bc6bc54dfa80f67c' 
  AND token = 'yHMwJ4fOOyLyvwbro7fHfQnrC5ChWCxeECnO8eoQVUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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