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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c1e0d0d39854df5597694b8e43e109032f7e2d6525363e09efd2fd60d0bf5d' 
  AND token = 'a1wUcfiRfsjAg2JF3Llp+lFS0OD/sk0DJ4CNp/Kph/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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