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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a108a2ead89c418591d647321d9bd40605bb6a8266b1f8eee360a55e1db3ebf7' 
  AND token = 'kME2qOoD0OQaVHBGLv++RuXDWB+87OAyBXr0pzGzh6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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