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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff81e99dea4db7243e6ccd5d94fa31bf8667b68aadf62f9d4b72e4c2318812d8' 
  AND token = 'iveLOLSJiD/+83Tu45s5Nq9ZHBeqF7DtyFZE6E2DvNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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