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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878e212e80d69c44770ba03abb8531b0ad2714f7f6a35a1ac78576b4128e885d' 
  AND token = 'GgNb9mUAk9DwPpGFWIEx+ALD6XUu289T2dT5z/Yh3fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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