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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dbdffc9356ce7586303c4fbdb4582ff0f189dd8758a4785d8de1abf8a7a8e2' 
  AND token = 'ZMilvo3fRu6p9eZl/fUsidCS1lfSQzV5qbZKr2/vMys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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