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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f399b19a9ec65d64c43a619cf2b5895e62cc07e62595f8a5ecdf5ebc5f4d7e' 
  AND token = 's1PT4Ux5Evd28BHQBdOPKn03RAR8WRr8TRHo1c57P5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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