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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c9c6e8af71f559e7b31d17c8ee681c41e94aef3409160bfe64e17809e28508' 
  AND token = 'ETTZw+hvsnu2YBLKvjSrH60IZ65bglENIlZKl9w9Z7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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