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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799691bf193796d4cc5063751a8500a1d47df0e1c491ef503f86821fd99072ad' 
  AND token = 'BybkFdWgmd2qwdjryvDjIotD2eH9Yjzcr+2GL6vw0K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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