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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac10e92d374f096ecc2ecb108eec79094309b39d7959e0fdf476ef88e8590b5' 
  AND token = '0GbGPvoD8qGNmF61ko8AnZ74nSz0MwO/KK2FxqXKfwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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