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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e30e00d2dffd1acd9064f2c28d859e5af9891bab9631cf61c3c053cc74f4e5' 
  AND token = 'qZx6S7FxWibKgM8rx4S3OoUcDKq6X2brBxln9lou7S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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