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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35ff5397d7b61f27c73e38eb43f36be7eab843e945d4ff71ee7da88278c9032' 
  AND token = 'mUIBQfor56PNQkisGBz19IUOCXoWxtQKfaO67mviUCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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