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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087270a360c4bf660fb0772e416c32213add630fa0c1107a6fa3a6975c7c3603' 
  AND token = 'Y21ky9Pyjwy7yhWGeqijWgCVhB1OHhDyia5JLHaaoRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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