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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9d19c80adc2fbefd0933f3732ae36b6c595a9e270dbf8de7f3c940fa268f0e' 
  AND token = 'yPzZDDavb/EmhVrq9ChqSzioFWRu8X61jCbJzzo7O8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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