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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85aaa07b6e5f7ed56360e03a5d097b6908b098a1db3f402c42927f2bdb20c5be' 
  AND token = 'F9LtiszM15zUp8e7mUODlLI68v4M5E7AQLGuW+9imXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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