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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3d57dd44aa16565c10027bf9a2b2a9fa519ed2a8ad225c7a39e92a292b6961' 
  AND token = 'nujEH7B7D6ZYdcEBNMBjkO1nf6ZscAAIvVDurp7Qrvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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