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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efbb8f4cfd47e0b32c3ddc0697d83ba45e11ee799c31b8ce47fa2e0665110e7' 
  AND token = 'cwHoKAkOoas9cfqc02rbw+wq7Uapv9LuvC4dYdHRbQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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