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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095e84d259466ca49fddabb510d5fce9283af70a38416ff6fc0552a2805af861' 
  AND token = '/fg1rSOTmkV4bCfjiQeaKDyka6zIkY5s9Hm4zmKqpVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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