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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79471b78560b81e9c7bbe0dde31473ef62266262842aeda719edb7e0348b59d' 
  AND token = 'iplOWT4aaT/ONPnvobIy4KBAIj0Q1RZytU0KzehqRvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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