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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffbb41c4dc4cec9f9e1cb7d2f6ac2fe977b4b6fad972da50f85eca7210310d1' 
  AND token = 'GBM3wKO9lbC7Kdot37TBwdlMdO2GBib+2B5lbyniSI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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