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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e05350e5dfd51aa5c52a46e09f60c2b4981fa80ff3181af6a1d1d4a3a27ebd7' 
  AND token = 'nK456wb961RsPQrz8BlykmMq1ClubQKYytGoM2IS1Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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