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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ca7050aa4f3b94c49b4adea400c6ff32ace920971000440b274e6dc2bd510b' 
  AND token = '92gUON0C3AVjmCKn25IDGojLNRtPaNWXWKoyjwsGaAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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