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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e8c7f12fa87a5df87ed215699daa8efeb49caf7eeafd9d610acf3313667435' 
  AND token = 'zZACOmL32PEZVpu75eu2Rj8PaCRFJCdZX2Tvo2BH0fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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