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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e31807133a14b4bd6510f4383e04f0fdcb60a8feeb44a45b1820cca1009cec' 
  AND token = 'K8LV+zPiV8IahvRDeDjblWIuH5byN2qB5pEgVGk51f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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