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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81032959ebdd942b7647e328989d94e0d95940e4798efc2bb645b3761844b6ff' 
  AND token = 'NAUTSlXuOT1bi5NqcbECBnMkqAWXyRneXq9kU6ubMOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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