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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f9005c6f1364cb8d28a1b98fb596801b591402c22d2fe42e6a9993e9d65f75' 
  AND token = 'AAVECt8PPMtSp139KWwsT08FeiXVuCWhoLOuJT1gwKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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