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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bb2556045593984a7c2fd0a8fc6b97643d0f04edcb1b509ec266e92883e205' 
  AND token = 'ND7lXn/Wune2bdUVAiss9XNdoMQyBhvZJRJdFVhSMUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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