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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf0dfb8acd8b83d45f43bcdd9ed9a96f9f10e6759efa7668fb6d74501681aef' 
  AND token = 'xOxx7T7x8Mfk31N5zLW/uYXGmUINKRl8Gdm1lJ52fLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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